Mamaroneck River
| Mamaroneck River Bonnie Brook, Merrimack River | |
|---|---|
Halstead Avenue, Mamaroneck | |
| Location | |
| Country | United States |
| State | New York |
| District | Westchester County |
| Physical characteristics | |
| Source | |
| • location | White Plains, New York |
| • coordinates | 41°02′34″N 73°45′08″W / 41.04288°N 73.75236°W |
| Source confluence | Sheldrake River |
| • coordinates | 40°57′18″N 73°44′12″W / 40.954914°N 73.736621°W |
| Mouth | Long Island Sound |
• location | Mamaroneck, New York |
• coordinates | 40°56′23″N 73°43′15″W / 40.9398209°N 73.7209638°W |
| Basin size | 17.4 sq mi (45 km2) |
The Mamaroneck River is a freshwater stream located in Southern Westchester County, New York. The river forms in White Plains and Harrison and flows 7.3 miles (11.7 km) south through Mamaroneck Town and Village, where it empties into Mamaroneck Harbor and Long Island Sound. The name of the river comes from a local native American word meaning, "where the fresh water meets the salt water." The river flows into Long Island Sound.
The watershed of the Mamaroneck River is 17.4 sq mi (45 km2). It is dominated by suburban residential neighborhoods and commercial and retail tracts. High density residential development also is prevalent throughout the middle and lower portions of the watershed.